Steps to Reduce Code Size after Use of Strategy Pattern

This article features a few tricks to reduce the size of the code resulting from the use of the ‘strategy’ pattern. As you can deduce from the title, all these tricks will be related to the usage of generic types.

1. Hierarchy of classes involved in magic rituals

Suppose we have an abstract ‘vehicle’ class that can move (the Move method). This class has 3 descendants: a car, a plane, and a rickshaw. Each of them implements the method in its own way: (more…)

Indicators of Problem Design

The concept of good or bad design is relative. At the same time, there are some programming standards, which in most cases guarantee effectiveness, maintainability, and testability. For example, in object-oriented languages, this is the use of encapsulation, inheritance, and polymorphism. There is a set of design patterns that in a number of cases have a positive or negative effect on the application design depending on the situation. On the other hand, there are opposites, following which sometimes leads to the problem design.

(more…)

Sliding Responsibility of the Repository Pattern

During numerous discussions about the applicability of the Repository pattern, I noticed that people are divided into two groups. In this article, I will call them abstractionists and concretists. The difference between them is in the way they treat the pattern value. The former believe that a repository is worthwhile, as it allows disregarding details of data storing. The latter suppose there is no way to disregard these details, therefore, the concept of repository makes no sense and its usage is a waste of time. The dispute between these two groups usually turns into a Holy War. (more…)

Specification Design Pattern in C#

In computer programming, the specification pattern is a particular software design pattern, whereby business rules can be recombined by chaining the business rules together using boolean logic. The pattern is frequently used in the context of domain-driven design.

In short, the main benefit of using “specifications” is a possibility to have all the rules for filtering domain model objects in one place, instead of a thousand of lambda expressions spread across an application.

(more…)